Air Tractor AT-400
# Air Tractor AT-400

The Air Tractor AT-400 is a family of agricultural aircraft that first flew in the United States on September 1979. Type certification was awarded to Air Tractor in April 1980. Of low-wing monoplane taildragger configuration, they carry a chemical hopper between the engine firewall and the cockpit.

## Variants

* AT-400 - AT-301 with 680 shp (507 kW) Pratt & Whitney Canada PT6A-15AG engine and 400 US gal (1,510 L) hopper. Short-span (45 ft 1¼ in (13.75 m)) wings. 72 built.
* AT-400A - AT-400 with 550 hp (410 kW) Pratt & Whitney Canada PT6A-20 engine. 14 built.
* AT-401 - AT-301 with longer-span wings and 400 US gal (1,510 L) hopper, powered by 600 hp (447 kW) Pratt & Whitney R-1340 radial engine. 168 built.
* AT-401A - AT-401 with PZL-3S engine. One built.
* AT-401B -Improved revision of AT-401, with revised wingtips and further increased span (51 ft 1¼ in (15.57 m)). 69 built by December 2001.
* AT-402 - AT-401 with Pratt & Whitney Canada PT6A-15 engine. 68 built.
* AT-402A - low cost version of AT-401B, with Pratt & Whitney Canada PT6A-20 engine. 103 built by December 2001.
* AT-402B - improved version of AT-402, with revised wingtips and increased span of AT-401B. 31 built by December 2001.

## Specifications (AT-401)

Data from Janes's All The World's Aircraft 1993-94.

General characteristics

* Crew: 1
* Capacity: 400 US gal (330 imp gal; 1,500 L) hopper
* Length: 27 ft 0 in (8.23 m)
* Wingspan: 49 ft 1+1⁄4 in (14.97 m)
* Height: 8 ft 6 in (2.59 m)
* Wing area: 294.0 sq ft (27.31 $m^2)$
* Aspect ratio: 8.20:1
* Airfoil: NACA 4415
* Empty weight: 4,135 lb (1,876 kg)
* Max takeoff weight: 7,860 lb (3,565 kg)
* Powerplant: 1 × Pratt & Whitney R-1340 radial engine, 600 hp (450 kW)

Performance

* Maximum speed: 156 mph (251 km/h, 136 kn) at sea level
* Cruise speed: 120–140 mph (190–230 km/h, 100–120 kn) (typical working speed)
* Stall speed: 61 mph (98 km/h, 53 kn) at 6,000 lb (2,700 kg) (max. landing weight) (flaps down)
* Range: 630 mi (1,010 km, 550 nmi)
* Rate of climb: 1,100 ft/min (5.6 m/s)
